Lattice-truss



D. W. MORRISON.

LATTICE TRUSS.A

. n APPLICATION FILED'FEB. I, 19.17. Pa'tnted 69 I Imm Ai'llllIIIIIlW/A Hmmm I s l .Y I I m I EI III I I IQ EN I'. *D m I? 2` SHEETS-SHEET 2.

D. W. MORRISON.

LATTICE TRUSS.

APPLICATION FILED FEB. I. I9I7.

truss.

DENNIS W. ivIonnIsoN, or rNnIeNa Hannon, INDIANA.

Application filed February 1, 191'?.`

To al?, whom t may concern.

Be it known that I, DnNNIs W. MonnIsoN,

a citizen of the United States, and a resident of the cityof Indiana Harbor, in the county ,of Lake and State of Indiana, `have invented certain l new and useful improvements in liatticeflrusses; and I do hereby` declare that `the following is a` full, clear, and eXact dey scription of the same, reference. being had to the accompanying drawings, and to the numerals `of reference4 marked thereon, which form a part `of this specification.

j `This invention relates to an improved `form of roof or bridge truss wherein the use of large heavytimbers is obviated `by the use of laminated,planlrsfor strips of lumber of light weight and of low cost, and where in the lattice work is constructed with its slats substantially atright` angles to one another and disposed substantially at an angle of fortyuive degrees with diagonal brace bars supporting the arched portion of the lt an object of this invention to construct an improved form of truss wherein the tiefbeam, braces and arch members are l oflaminated construction to increase the strength and reduce the costof construction of the truss. y y l.

lit is also an object provide an improved truss whereinthe slats forming the lattice work` of the truss are at right angles to one another and atan angle of fcrtydive degrees with diagonal braces used in supporting the arched portion of the truss.

lt is furthermore an important object of this invention to` construct an improved form of lattice truss whereinthe straight and curved chords are of a laminated construction, and wherein the slats forming the lattice work are disposed at an angle of forty live degrees to the laminated diagonal braces of the truss.

. lt is iinally an object of this `invention to construct a truss of great strength, simple and inexpensive in construction.

The invention (in a preferred form) is illustrated in the drawings and hereinafter more fully described.

ln the drawings:

Figure l is a side elevational view of a lattice truss embodying the principles of my invention. v

Fig. 2 is a top plan view thereof.

l Specification of.' Letters Patent. Y i

of this invention to y Patented July ti, 1920.. Serial No. 145,963.

Fig. 'is a section taken on line 3--3 of l Fig. la

lFig. d is a section taken on line LL-l of Fig. 1.

Fig. 5 is an enlarged detail side view of one end of the truss withthe tie-beam and arched portion omitted.

. Fig. `G is a transverse scetion taken on line 6*-6, of Fig.` 5.

l'dlig. 7 is a transverse section taken on line 7-7 of F ig. 5.

Fig. 8 is a transverse section taken on line 88 of Fig-5.` j

Fig. 9 `is a side view in elevation of a modified form of truss used in conjunction with truss rods. v

As shown on the drawings:

The tiebeams, straight or lower chords of the truss, are represented by the reference numeral l, and are of laminated construction or made up of two or more strips of lumber', or other suitable material, mounted in parallel relation adjacent one another. Said tie-beams are located one on eachside of the lower portion of the truss, and entend longitudinally for the entire length thereof to form the foundation of the truss. Mounted in the same plane with each of the tie-beams are two sets of bracesor rafters 2, each of laminated construction comprising two or more thicknesses and extendingdiagonally upwardly toward one another to a point centrally located 'above the tie-beams. rlhe upper ends of said braces form a miter joint, while the lower ends are tapered as shown by the reference numeral 3, to fit into notches cut in the upper portion of each of the tie-beams l, at a point a short distance from each end thereof, to form a scarfed joint. Braced centrally against the upper surface of each of the tie-beams l, and extending upwardly to fit beneath the upper abutting ends of the braces 2, is a laminated strut 4;. Rigidly secured in notches cut in each end of `the upper surface of each of the tie-beams l, and to .the outside of the scarfed joints therein, are laminated arched or inner curved chords 5, which are curved upwardly The lattice Work fof lthe truss which is mounted-between and joins the vrespective side portions of the truss, comprises a .plun rality of slats, swayV bracesor lattice mem- `bers 6 and 7, mounted at right. anglesfand space-d equidistantly from one anothenin parallel relation. vSaid `slats v6 and 7, are disposed at an angle of forty-five degrees with Vrespect tothe/diagonal braces' 2,to which they are secured, as clearly shown in Figs. l ande. r

The' side portions and the lattice Work comprisingthe truss are rigidlyysecured toygether by nails or spikes 8, or other suitable means, i the A.spaces between the -outer .ends of, vthe tie-beams l, havingI disposed therein filler blocks 9,'While-iller-Sslats 410,

are used v Where necessary-to 'f iill the spaces between the upper ends of the esliats': and 7 and the inner curved chords 5. Q'lhe fillers 9 and l0, areused `inl conjunction with vthe otherfmemberso the' truss to. aord a solid construction at points'` inv the 'K truss Where'zthe nails orgsp'ikes are=driven in. As clearly shown-1n Figs'.I l, 5- andai); both ends of the lattice Workare made solid `to act as a reinforcing means` `orthe ends oi' 'the' truss.

.li/[ountedover thenpper ends ofl Vthe slats 6 andZ-and over the" .inner curved 'chords 5,is a laminated,archv member or outer i j Y 1,345,501

beams of .the truss, while struts 15, are used Vto brace the truss rods at points intermediate the ends. thereof.

It will, of course, be understood that the ivarious laminated members, When necessary,

may be made up of a number of dili'erent lengths properly spliced together, and furthermore'that solid members may be used tin.fplacelof.elaminated members, if so desired, when practicable.

I am also awarethatr varlous-otl1e1"de- :tails lofoonstruction imay-'be varied throuvh afrivfifde range:Without'fdeparting froid the principles lofi this' invention, *and* I there- I claiml as my invention A i Atruss Ycomprising =1n combination a straight fehord,1 :1n-arched member secured thereto, diagonal braces 'extending fromthe center of saidmember fto the end"portions of thevchoid, and la'ttice'members in each half of the truss; themembers in eaclr h'ali' crossingvea'ch'other at right anglesauid' the adjacent'diagonal brace at an angle of V'fortyive degrees, vwhereby oneset 'of' members is linclined tothe 'chordv :it-)an angle of'less than Iforty-tive degrees an'd the lbthersl'et is inclinedto the'chordat alran'gle Aof more than" ortyfive degrees; "thel llattice 'members in xone half of the trusscom'erging toward the latticevmembers in the other halffthe first set rinembersconvergingupwardly and the other set converging downwardly 'In "testimony rwhereof il have 'hereunto subscribed my name'in the presence of two subscribing Witnesses.

DENNIS W. MORRISON. Witnesses z f CHARLES WV. HILLS, LJr.,

W. "R. MORRISON. 

